You will want to take the negative inverse to find the time constant: so (-1/slope) -1/-5.15E-3 194.17 sec Then to get the uncertainty: absolute value of T(uncertainty of slope/slope) abs value194.17(8E-5/-5.15E-3) 3.01 sec.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.